well, your standard park bench has an overall height of 31 ½ " . based off of the top tube being just under the top of the bench, correcting for angle of picture, and taking into account the length and angle of the shadow cast, if i were to triangulate those figures, i would say the size of the bike is either a grande or venti, no room for cream, thanks.

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Originally Posted by badamsjr

If you are looking for help in figuring out the size, measure from the center of the crank spindle bolt to the center/top of the top tube.

If you want guesses, I'll go with 58--solely on the head tube length.

Looking at the headtube length, I'd put it at 25" or about 63cm. I measured the crank arm in the picture and assumed a 170mm crank then worked out a ratio of picture length to fit that 170mm crank. Applying that ratio to the frame, I came up with something very close to 63cm.

Looking at the headtube length, I'd put it at 25" or about 63cm. I measured the crank arm in the picture and assumed a 170mm crank then worked out a ratio of picture length to fit that 170mm crank. Applying that ratio to the frame, I came up with something very close to 63cm.

The best way to tell is to measure the seat tube, of course.

I like your thinking but a more definitive standard might be the diameter of the wheels rather than the crank length. I wonder if they are 700c or 27"?

cyccommute: If your pics of the 63cm and 58cm are 'normal' size, then the OP's pic MAY be a 59 or 60, but there seems to be quite a bit of difference in head tube length in the 63 pic and the OP's pic.

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Originally Posted by badamsjr

cyccommute: If your pics of the 63cm and 58cm are 'normal' size, then the OP's pic MAY be a 59 or 60, but there seems to be quite a bit of difference in head tube length in the 63 pic and the OP's pic.

There is some variance between manufactures on headtube length (lots of it actually) but the main thing to look at is that the headtube on ziggy's picture is much longer than the 23" bike I posted. Look at the seatstays and how high the top tube is in relation to the rear wheel. Ziggy's is much closer to a 25" than the 23".

I wouldn't try this, by the way, with a sloping top tube bike. But old horizontal top tube frames are pretty easy to eyeball the size...especially big boys like this one.